In which of the following cycles does heat addition NOT take place at constant volume? 

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SSC JE Mechanical 9 Oct 2023 Shift 2 Official Paper-I
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  1. Lenoir cycle 
  2. Dual cycle 
  3. Otto cycle 
  4. Diesel cycle 

Answer (Detailed Solution Below)

Option 4 : Diesel cycle 
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Detailed Solution

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Concept:

Diesel Cycle is also known as a constant pressure cycle as heat is supplied at constant pressure is in this cycle. A Diesel Cycle is shown below

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Process 1-2 is isentropic compression

Process 2-3 is constant pressure heat addition

Process 3-4 is isentropic expansion

Process 4-1 is a constant volume heat rejection

Note: In Otto Cycle Heat is supplied at constant volume therefore it is called constant volume cycle. It is shown in the figure below

SSC JE Mechanical 15 10Q 25th Jan Morning Part 4 Hindi - Final images Q3d

Process 1-2 is isentropic compression

Process 2-3 is constant volume heat addition

Process 3-4 is isentropic expanison

Process 4-1 is constant volume heat rejection

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